The eyes are especially afraid of sunlight called photophobia, which has many causes: 1, commonly for dilated pupils, the causes of which include dilating eye drops after use, contusion of the pupillary sphincter after eye trauma, acute glaucoma after an attack, ankylosing pupils, cranial trauma or actinic nerve palsy, etc. Patients with congenital aniridia and albinism can also have similar symptoms; 2, ocular surface diseases can also appear photophobia, such as keratitis , corneal foreign body; 3, children who often close one eye in the sunlight may have intermittent exotropia, because the eyes have a strong ability to fuse, most of the time the eye position in the middle, only when looking at a distance or fatigue will appear exotropia, so to prevent the emergence of diplopia, in the sunlight children like to close one eye.